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Home My WebLink AboutNC0058891_Draft_FactSheet_20231010 Fact Sheet for Permit Renewal Sept 2023 - NPDES Permit NC0058891 - Page 1 NCDEQ / DWR / NPDES EXPEDITED FACT SHEET - NPDES PERMIT RENEWAL NPDES Permit NC0058891 Caroline Robinson / Compliance & Expedited Permitting Unit / caroline.robinson@deq.nc.gov / Sept 2023 FACILITY INFORMATION Applicant/Facility Name Hawksnest Utilities, Inc. (Leonard Cottom, Owner) Valley Creek WWTP Applicant Address/Mailing Address 2058 Skyline Drive, Seven Devils, NC 28604 Facility Physical Address NCSR 1151, Foscoe, NC 28604 As-Built Flow (MGD) 0.01 MGD Permitted Flow (MGD) 0.09 MGD Type of Waste 100% Domestic, < 1 MGD Facility Class WW-2 County Watauga Permit Status Renewal Regional Office WSRO STREAM CHARACTERISTICS Receiving Stream Valley Creek Stream Classification C; Trout Stream Segment 8-4 Outfall Lat. 36° 08' 49" N 7Q10 - Summer (cfs) 0.3 Outfall Long. 81° 48' 44" W 7Q10 - Winter (cfs) 0.3 Drainage basin Watauga River Basin 30Q2 (cfs) 0.7 Subbasin 04-02-01 Average Flow (cfs) ~ HUC 060101030301 As-Built Flow IWC (%) 4.91% - Summer & Winter 303(d) List No Permitted Flow IWC (%) 31.74% - Summer & Winter BASIC INFO FOR EXPEDITED PERMIT RENEWAL Does permit need Daily Max NH3 limits? Updated the monthly average NH3 as N effluent limit for the summer months (April 1 – October 31) for 0.01 MGD flow based on the IWC calculations and 2016 NH3 guidance document. The monthly average summer limit for NH3 as N will be 16.1 mg/L. Added the monthly average and daily maximum NH3 as N effluent limits for the winter months (November 1 – March 31) for 0.01 MGD flow. The monthly average winter limit for NH3 as N will be 32.4 mg/L and the weekly average winter limit will be 35 mg/L. The changes can be found in Part I. A. (1.). Does permit need TRC limits/footnote? No - Already present in permit. Does permit have toxicity testing? No – not a complex wastestream Does permit have any Special Conditions? No Does permit have instream monitoring? Yes – U & D for Temperature and Dissolved Oxygen due to Trout Waters New expiration date: Aug 31, 2028 FACILITY SUMMARY Hawksnest Utilities, Inc. operates a 100% domestic wastewater treatment plant for 15 residents. The Valley Creek WWTP is a minor facility (flow < 1 MGD) with an as built design capacity wastewater discharge of Fact Sheet for Permit Renewal Sept 2023 - NPDES Permit NC0058891 - Page 2 0.01 MGD and a permitted wastewater discharge of 0.09 MGD. The original NPDES permit for this facility was issued in August 1984. This facility utilizes the following treatment components:  Influent holding tank  Bar screen  Aeration basin  Clarifier with sludge return  Aerated sludge holding tank  Tablet chlorinator with chlorine-contact chamber  Dechlorination  Re-aeration chamber RENEWAL SUMMARY This renewal contains the following changes:  Added effluent monitoring for turbidity to the table in Section A. (1.) and the table in Section A. (2) to determine compliance with 15A NCAC 02B.0211 (21) for Trout waters.  Updated eDMR language for electronic data submission in Part I. A. (4).  Updated the monthly average NH3 as N effluent limit for the summer months (April 1 – October 31) for 0.01 MGD flow based on the IWC calculations and 2016 NH3 guidance document. The monthly average summer limit for NH3 as N will be 16.1 mg/L. The changes can be found in Part I. A. (1.).  Added the monthly average and daily maximum NH3 as N effluent limits for the winter months (November 1 – March 31) for 0.01 MGD flow based on the IWC calculations and 2016 NH3 guidance document. The monthly average winter limit for NH3 as N will be 32.4 mg/L and the weekly average winter limit will be 35 mg/L. The changes can be found in Part I. A. (1.). COMPLIANCE HISTORY Valley Creek WWTP has had no enforcements since 2009. The facility was issued a NOV on March 21, 2023; however, it was retracted on April 21, 2023 because the wrong effluent limits were placed in BIMS and the facility was not out of compliance for the current as-built wastewater discharge flow of 0.01 MGD. BIMS has been corrected to reflect effluent limits and monitoring requirements for the correct wastewater discharge flow. Most recent inspection (October 2019) showed the facility to be in compliance. COMMENTS ON DRAFT PERMIT Ben Kirby (Winston-Salem Regional Office) noted:  The Public Water Supply Section concurs with the issuance of this permit provided the facility is operated and maintained properly, the stated effluent limits are met prior to discharge, and the discharge does not contravene the designated water quality standards, with the following note: o The currently allowable permitted flow is listed as 0.01 MGD. Given that significant digits can play a major role in compliance determinations, the instances of “0.010 MGD” (see pages 3 and 5 of the Draft Permit) should be revised to “0.01 MGD”. Similarly, the “0.090 MGD” in the Draft Permit limit table (pg. 5) should probably be “0.09 MGD”. At a minimum, the significant digits should be consistent.